This part not only protects the lens, it also makes what it is supposed to protect from the sun sun.
I took the part mainly for fast photo between, on holiday but also happy at work (Product Photos) with very strong sun comes every now and then a larger part of it.
Conclusion: The Lens Hood is a basic product which can always be used. The size is perfect, if it must go fast times come only the aperture 60c into play. With the larger aperture I have not in any case back and once had my problems again, but herewith.
Who aperture a allover against light should look for access here, it is a basic part and a must-have, useful for both borrowing and professional. If you have a Canon SLR camera should really treat this aperture time came. I only recommend;)